Black ring with white code:
4-number-number-number
7-number-number-number
K-number-number-letter
T-number-number-number
U-letter-number-number
U-number-number-number
number-letter-number
number-number-letter
letter-number-letter
U (horizontal)-number-number-number (vertical)
Renaud Flamant, avenue de la Chapelle, 255, B-1950 Kraainem, Belgium
e-mail: renaud.flamant"at"gmail.com
Note:
– It is very unlikely that any of the rings with "U (horizontal)-number-number-number (vertical)"
still exist.
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